The Jolie-Pitt family got together with friends on Saturday to celebrate Maddox's birthday. Maddox, who turned 9 on August 5th, chose a racing theme for his party. Brad and Angelina rented out the entire park at Go Kart World in Carson, California. A source shared with

: "It was closed down to the public to make sure that Maddox and his friends would be able to have a fun party in private." Maddox and the other kids raced on the mini Indy tracks and munched on pizza. "They acted very happy and relaxed together. Their other children also seemed to enjoy the racetrack and the party."

It's nice to know that celebrities don't always have to go overboard with their kids' birthday parties; they throw parties just like we do. Except that whole closing down the entire park thing. We'd have to celebrate alongside 12 other birthday parties. Ha-ha.

Ann Monroe (aka Maureen Smith) is a Santa Monica based writer and editor who drives her friends and family crazy with her non-stop love for wordsmithing & humour. Her relentless passion for writing, design, research and travel has steered her into many life adventures ranging from writing to winemaking to real estate project development.